Build and attach acme.js to release

[zsteinkamp]

Proposed changes

Adds a Github action that runs on Release creation that builds acme.js and attaches it to the release.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md and CHANGELOG.md)

[ryepup]

I think there might be a path with fewer/zero action dependencies.

[zsteinkamp]

You rock, @ryepup !